Ezekiel 3:5

For thou art not sent to a people of a strange speech and of an hard language, but to the house of Israel;

Thou art not sent to a people of a strange speech and of an hard language - (see margin, Hebrew, 'deep of lip and heavy of tongue'-i.e, men speaking an obscure and unintelligible tongue). Even they would have listened to the prophet; but the Jews, though addressed in their own tongue, will not hear him.